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Add wordy
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‎config.json‎

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"prerequisites": [],
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"difficulty": 6
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},
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{
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"slug": "wordy",
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"name": "Wordy",
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"uuid": "4aab08ad-7c41-427c-966e-cd90f4dc7ba5",
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"practices": [],
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"prerequisites": [],
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"difficulty": 6
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},
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{
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"slug": "knapsack",
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"name": "Knapsack",

‎exercises/practice/wordy/.docs/instructions.md‎

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# Instructions
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Parse and evaluate simple math word problems returning the answer as an integer.
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## Iteration 0 — Numbers
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Problems with no operations simply evaluate to the number given.
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> What is 5?
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Evaluates to 5.
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## Iteration 1 — Addition
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Add two numbers together.
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> What is 5 plus 13?
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Evaluates to 18.
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Handle large numbers and negative numbers.
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## Iteration 2 — Subtraction, Multiplication and Division
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Now, perform the other three operations.
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> What is 7 minus 5?
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2
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> What is 6 multiplied by 4?
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24
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> What is 25 divided by 5?
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5
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## Iteration 3 — Multiple Operations
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Handle a set of operations, in sequence.
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Since these are verbal word problems, evaluate the expression from left-to-right, _ignoring the typical order of operations._
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> What is 5 plus 13 plus 6?
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24
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> What is 3 plus 2 multiplied by 3?
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15 (i.e. not 9)
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## Iteration 4 — Errors
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The parser should reject:
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- Unsupported operations ("What is 52 cubed?")
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- Non-math questions ("Who is the President of the United States")
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- Word problems with invalid syntax ("What is 1 plus plus 2?")

‎exercises/practice/wordy/.meta/config.json‎

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{
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"authors": [
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"keiravillekode"
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],
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"files": {
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"solution": [
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"wordy.el"
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],
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"test": [
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"wordy-test.el"
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],
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"example": [
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".meta/example.el"
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]
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},
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"blurb": "Parse and evaluate simple math word problems returning the answer as an integer.",
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"source": "Inspired by one of the generated questions in the Extreme Startup game.",
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"source_url": "https://github.com/rchatley/extreme_startup"
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}

‎exercises/practice/wordy/.meta/example.el‎

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;;; wordy.el --- Wordy (exercism) -*- lexical-binding: t; -*-
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;;; Commentary:
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;;; Code:
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(defun calculate (left tokens)
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(if (null tokens)
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left
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(let ((operation (car tokens)))
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(cond
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((string= operation "plus") (calculate (+ left (string-to-number (cadr tokens))) (drop 2 tokens)))
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((string= operation "minus") (calculate (- left (string-to-number (cadr tokens))) (drop 2 tokens)))
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((and (string= operation "multiplied") (string= (cadr tokens) "by")) (calculate (* left (string-to-number (caddr tokens))) (drop 3 tokens)))
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((and (string= operation "divided") (string= (cadr tokens) "by")) (calculate (/ left (string-to-number (caddr tokens))) (drop 3 tokens)))
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(t (error "unknown operation"))))))
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(defun answer (question)
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(unless (string= (substring question -1) "?") (error "syntax error"))
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(let ((tokens (split-string (substring question 0 -1))))
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(unless (string= (car tokens) "What") (error "unknown operation"))
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(unless (string= (cadr tokens) "is") (error "unknown operation"))
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(calculate (string-to-number (caddr tokens)) (drop 3 tokens))))
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(provide 'wordy)
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;;; wordy.el ends here
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‎exercises/practice/wordy/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[88bf4b28-0de3-4883-93c7-db1b14aa806e]
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description = "just a number"
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[bb8c655c-cf42-4dfc-90e0-152fcfd8d4e0]
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description = "addition"
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[79e49e06-c5ae-40aa-a352-7a3a01f70015]
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description = "more addition"
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[b345dbe0-f733-44e1-863c-5ae3568f3803]
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description = "addition with negative numbers"
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[cd070f39-c4cc-45c4-97fb-1be5e5846f87]
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description = "large addition"
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[0d86474a-cd93-4649-a4fa-f6109a011191]
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description = "subtraction"
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[30bc8395-5500-4712-a0cf-1d788a529be5]
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description = "multiplication"
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[34c36b08-8605-4217-bb57-9a01472c427f]
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description = "division"
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[da6d2ce4-fb94-4d26-8f5f-b078adad0596]
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description = "multiple additions"
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[7fd74c50-9911-4597-be09-8de7f2fea2bb]
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description = "addition and subtraction"
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[b120ffd5-bad6-4e22-81c8-5512e8faf905]
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description = "multiple subtraction"
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[4f4a5749-ef0c-4f60-841f-abcfaf05d2ae]
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description = "subtraction then addition"
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[312d908c-f68f-42c9-aa75-961623cc033f]
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description = "multiple multiplication"
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[38e33587-8940-4cc1-bc28-bfd7e3966276]
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description = "addition and multiplication"
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[3c854f97-9311-46e8-b574-92b60d17d394]
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description = "multiple division"
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[3ad3e433-8af7-41ec-aa9b-97b42ab49357]
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description = "unknown operation"
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[8a7e85a8-9e7b-4d46-868f-6d759f4648f8]
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description = "Non math question"
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[42d78b5f-dbd7-4cdb-8b30-00f794bb24cf]
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description = "reject problem missing an operand"
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[c2c3cbfc-1a72-42f2-b597-246e617e66f5]
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description = "reject problem with no operands or operators"
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[4b3df66d-6ed5-4c95-a0a1-d38891fbdab6]
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description = "reject two operations in a row"
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[6abd7a50-75b4-4665-aa33-2030fd08bab1]
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description = "reject two numbers in a row"
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[10a56c22-e0aa-405f-b1d2-c642d9c4c9de]
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description = "reject postfix notation"
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[0035bc63-ac43-4bb5-ad6d-e8651b7d954e]
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description = "reject prefix notation"

‎exercises/practice/wordy/wordy-test.el‎

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;;; wordy-test.el --- Tests for Wordy (exercism) -*- lexical-binding: t; -*-
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;;; Commentary:
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;;; Code:
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(load-file "wordy.el")
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(declare-function answer "wordy.el" (question))
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(ert-deftest just-a-number ()
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(should (= 5 (answer "What is 5?"))))
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(ert-deftest addition ()
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(should (= 2 (answer "What is 1 plus 1?"))))
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(ert-deftest more-addition ()
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(should (= 55 (answer "What is 53 plus 2?"))))
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(ert-deftest addition-with-negative-numbers ()
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(should (= -11 (answer "What is -1 plus -10?"))))
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(ert-deftest large-addition ()
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(should (= 45801 (answer "What is 123 plus 45678?"))))
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(ert-deftest subtraction ()
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(should (= 16 (answer "What is 4 minus -12?"))))
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(ert-deftest multiplication ()
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(should (= -75 (answer "What is -3 multiplied by 25?"))))
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(ert-deftest division ()
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(should (= -11 (answer "What is 33 divided by -3?"))))
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(ert-deftest multiple-additions ()
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(should (= 3 (answer "What is 1 plus 1 plus 1?"))))
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(ert-deftest addition-and-subtraction ()
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(should (= 8 (answer "What is 1 plus 5 minus -2?"))))
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(ert-deftest multiple-subtraction ()
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(should (= 3 (answer "What is 20 minus 4 minus 13?"))))
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(ert-deftest subtraction-then-addition ()
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(should (= 14 (answer "What is 17 minus 6 plus 3?"))))
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(ert-deftest multiple-multiplication ()
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(should (= -12 (answer "What is 2 multiplied by -2 multiplied by 3?"))))
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(ert-deftest addition-and-multiplication ()
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(should (= -8 (answer "What is -3 plus 7 multiplied by -2?"))))
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(ert-deftest multiple-division ()
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(should (= 2 (answer "What is -12 divided by 2 divided by -3?"))))
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(ert-deftest unknown-operation ()
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(should-error (answer "What is 52 cubed?")))
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(ert-deftest non-math-question ()
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(should-error (answer "Who is the President of the United States?")))
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(ert-deftest reject-problem-missing-an-operand ()
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(should-error (answer "What is 1 plus?")))
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(ert-deftest reject-problem-with-no-operands-or-operators ()
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(should-error (answer "What is?")))
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(ert-deftest reject-two-operations-in-a-row ()
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(should-error (answer "What is 1 plus plus 2?")))
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(ert-deftest reject-two-numbers-in-a-row ()
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(should-error (answer "What is 1 plus 2 1?")))
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(ert-deftest reject-postfix-notation ()
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(should-error (answer "What is 1 2 plus?")))
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(ert-deftest reject-prefix-notation ()
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(should-error (answer "What is plus 1 2?")))
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(provide 'wordy-test)
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;;; wordy-test.el ends here

‎exercises/practice/wordy/wordy.el‎

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;;; wordy.el --- Wordy (exercism) -*- lexical-binding: t; -*-
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;;; Commentary:
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;;; Code:
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(defun answer (question)
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(error "Delete this S-Expression and write your own implementation"))
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(provide 'wordy)
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;;; wordy.el ends here
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